Air strainer for horns



Oct. 24, 1933. 5 G DOWN AIR STRAINER FOR HORNS Filed Oct. 9, 1931 INVENTOR. SIDNEY 6. DOWN A TT ORNE Y.

. 35" anchonbolts for Patented Oct. 24, 1933 1,932,03 7 AIR; STRAINER' on anomvs Sidney'G; Downi Edgewooi Pai,'assignor to The" Westinghouse Air' Br'ake Company, Wilmerdin'g, 7

Pin; a corporatio'nnof Pennsylvania t Application ctoheri,.9,-:1931. Serial No. 567,837

This invention relates: to; air strainerss-andmore; particularlyto: an vair::stra'iner:aadapted- :for "use, inzoonj unction with pneumatic: horns to. prevent: the?v admission of foreign; matterrinto; "the -.=dia:-:,i

6 phragngrichamberofthehornru i One object of ;the present-zinventionisthe: proi; visionrin ;a ipneumatic'horn-zof: improved means for positioning and retaining an air strainer in; the: horn bracket, i'

I Another object resides in-theprovisionof 'anair. strainer. adaptedxto. be readily :appliedto. or, removeclwfrom' the pneumatic hour to facilitatez its; inspection,i.icleaning-,' and: replacement;

A further, object. -lies' in :the improvedrrcons.

151' struction and, arrangement of :partsiwhich provide; a :horn capableiof beinghnanufactured rat a comparativelylow cost:v

Other: objects and advantages-will fappearfromi the. following description: of"an.:illustrativee em;

20. bodiment ,of the present inventions. r

v In rgthe-v drawing, 1, Fig. 1 sis a ssectional; wiew= through a pneumatic horn taken on the.linei1 1-- of:Fig::-2;';-:and Fig."-2 isia rear1e1evational:viewaof a pneumatichorn, "embodying ,myzinvention; with.

parts broken..away.- to morerclearlyi show its con-1i struction.- I

. Thezpneumatimhormr to: which thezairstrainen: of r the present invention is J applied, comprises: a body portion 10' having a pairsof .fluid pressure.

30. chambers: containing flexibleydiaphragms (not: shown); by;=.the: operation zofc'whic'hvsounds are: produced: .A mounting bracket-11'isform'edein tegral with zthebody 1 portion :10 anduis provided: with an ,extencled'flat base; 12 perforatedto receive:

securing 1thehorn tozanyzsuitable supportra 1 Anhamber 13:; formed inithe mounting bracket:

11; is provided-with a pair of:screwethreadedfaperatllI'BSxliE (one ofv which is shown) adapted to ses 405 lectivelyireceive a supply" pipe 15 for-delivering fiuid -underpressure to the horn'from anysuit able source of *sup'ply; A pipe plug 16 serve sfasa closure forthe unused-opening 1-4 whichserves as a drainopening. A bore 17 vextendinglinrwaI'd-- ly*'from its open end in the side face of the bracket connects'the chamber13 withra chamber, 18formed'ina boss 19Qon thelsideof .themountel ing bracket-r A -pair. of,passages v 20,, and 20 ,.,.ofi relatively'small. capacity comparedwiththe sup ply pipe provide open communication.,betweenthechamber-iB and chambers2Land-2lf, respec-v';

tively. A port 2j2tiormed in: the-wallof', chamber: 21 leads to one;ofvtheifluidcpressure: chambers: of; the pneumatic zhorn.:.. ,Thej: chambergZ 1.-: communicatess inLza similar 'mannerxwithithe other fluid pressure chamber of :thefhorn. r

The; .airi strainer; which servesto' prevent' the admission of foreign matter to th diaphragm chamber of the .-'h0rn',"'.is:positionedtin thev bore '30 Hi and :comprises; a :massiof: fsuitable straining material 23 such as curled hair held in place by a :pair iota-perforated discsczig-ithezflowareazbf the perforations beingigreater :than TbhfitfiOfiIthB com-=2: binedpassagesi 20and '20.. 1The1 strainerllsipo sitioned in the =bore-t'17by insertingta disca24ithrough' anropening: 25 in'i the boss l9ifaThe disciisiseated against-a flange'26-'formed':imthe borefill and curled hair orxthe' like-is? placediinitherbore l'li A'rsecondiperforatededisc 24-;iis' therrzplacedrin (0 1 the iborer-randzretained bynthe application fofsia spring ring 27, which'seats in a groovef28.formed= in :theawall of the bore 17. In thismanner; the straining: material. issconfirled rwithin' :theabore 17: byithe diSCSx'24. and form'sa massrofiipervious 4 material through which l'fluid: undenpressurer-ria passed: was to remove foreign matterznfro'm the fiuidwprior' to the admission of": the; fluid. vto the: pressure chambers ofwtherpneumaticlhomxi After: thezstrainer has beenrproperly: positioned-in the: so bone 1 7 of' therhornibracket'; a plug; 29: is screwed into the opening: 525 .130 formia closure "for @the chamber 18.11 r i .f Insoperatiom-fluid underrpressureis admitted to thexchamber '13throughtheusualssupplyriipe" I 15- and-.1fl0ws :to the chamber '18 after passing through the :borerl'? containing-thestrainerwhich is adaptedtozcollect all foreign"matterlcontained' in the fluid as the; fluid passes at a relatively'slow 'velocityith'rough :th'erstrainergxiFrom thewhambeta-18, :thewfiuid' passestthroughipassages 20am 20 tos'chambers: 211' and :211'.; "respectively, 'and' thence: throughz ..p0r.ts":22; one of -which is shown" in the drawing) to the diaphragm chambersformed :inthB' hOIIlbOdYi 10. As'pressureis built up: in the diaphragm chambers, the horns function inethe usual manner. I i

It" has 'beenxtfound that the application 01: 3, strainer elementtorthe horn has-eliminated the" admission: of foreign"matter 1 to the diaphragm IOO chamber of 1 the. horn and thus mater;iall3" in creased-its servicea'bilityl' From time to timefit is advisable to". replace-the strainer material whichf in. operation, becomes impregnated foreign" matter; This replacement 'may "readily beef fected by removal of the plug :29whibhfmakehthe strainer element accessible; 'The'spring ring 27L'may then :be: displaced and the discs'24' and: curled-hair23'may be easily 'withdrawnfromthe borez1'7 through the opening- 25 formed-in the 110,

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boss 19 of the mounting bracket 11. The mass of straining material may then be cleansed of its foreign matter, or replaced by new material and the strainer repositioned in the bore 17 in the manner previously described, and upon replacing the plug 29 the horn will again be ready for use.

It will readily be seen that an improved pneumatic horn has been provided in which a strainer element has been embodied to insure long periods of satisfactory operation by eliminating the admission of foreign matter to the diaphragm chambers of the horn, which in the past has been a source of diiiiculty. It will also be seen that the strainer element of the present invention is readily accessible for inspection, repairor replacement without necessitating the removal.

of or dismantling of the horn to effect the desired operation.

While the invention has been described in considerable detail in the foregoing specification, it will be understood that various changes may be made in its embodiment without departing from or sacrificing anyv of the advantages as hereinafter claimed. 7

Having now described my invention, what I claim as new and .desire to secure by Letters Patent, is:

1. The combination with a sound producing device comprising a body portion provided with a diaphragm chamber and having a mounting bracket formed integral. with said'body portion and having an attaching face and a side face and provided with a bore accessible from the side face, through which fluid is supplied to said diaphragm chamber, of a strainer mountedin said bore for removing foreign matter from fluid supplied to said chamber.

2. The combination with a sound producing device comprising a body portion provided with adiaphragm chamber and having a mounting bracket formed integral with said body portion and provided with a bore, through which fluid is-supplied to said diaphragm chamber, of astrainer mounted in said bore for removing for-.

eign matter from fluid supplied to said chamber, said bore having an atmosphere opening through which said strainer may be removed, and a removable plug for closing said opening. I .3.,,,The combination with azsound 'producing device comprising a body portion provided with a diaphragm chamber and having a mounting V bracket formed integral with said body portionand having anattaching face and a side face and providedwith a bore accessible from the side face, throughwhich fluid is supplied to said diaphragm chamber, of a strainer comprising a mass of perv ious materialadapted to be received in said bore, and means for retaining said strainer in said bore.

i, The combination with a sound producing 7 device comprisinga body portion provided with a diaphragm chamber and havinga mounting bracket, formed integral with said body portion and provided with asbore through which fluid is supplied to said diaphragm chamber, of a strainer comprising amass of perviousmaterial adapted to be received in said bore, and means'for retaining said strainer in said bore, said bore'having an atmosphere opening through which-said 4 strainer may be remoVe=;l,.,and a removable plug for closing said'opening. 5, The combination with. a pneumatic horn, of a strainerfor removing foreign matter from fluid supplied to said horn, said horncomprising a A body portion provided with a diaphragm chama bore accessible from the side face, through which fluid is supplied to said diaphragm chamber and means for retaining said strainer in said bore.

6. A pneumatic horn comprising a body portion, a diaphragm chamber in said body portion, a mounting bracket formed integral with said body portion and having an attaching face and a side face provided with an opening, a straining chamber in said mounting bracket communicating with the diaphragm chamber and the said opening, astrainer in said strainer chamber adapted to remove foreign matter from fluid supplied to said diaphragm chamber and accessible through the said opening, and means for releasably retaining said strainer in said strainer chamber.

7. A pneumatic horn comprising a body portion, a diaphragm chamber in said body portion, a mounting bracket formed integral with said body portion, a bore in said mounting ,bracket,'ai

strainer in said bore'adapted to remove foreign .matter from fluid supplied to said diaphragm chamber, means for releasably retaining said strainer in said bore and removable means associated with'said bore adapted to facilitate the application of said strainer to said bore.

8. A pneumatic horn comprising a body portion,

of pervious material, and a removable closure for said opening. I

9. A pneumatic horn comprising a body portion, a diaphragm chamber in said body portion, a

mounting bracket formed integral with said body portion, a bore in said mounting bracket, a strainer in said bore adapted to remove foreign matter from fluid supplied to, said diaphragm chamber, said strainer comprising a mass of pervious material, perforated means for confining said mass of pervious material, means for releasably retaining said strainer in said bore, and a removable plug associated with said bore to facilitate application of said strainer to said bore.

10. A sound producer comprising a casing having a pair of diaphragm chambers, a mounting bracket formed integral with said casing and having an attaching face and a side face provided with an opening and having a strainer chamber through which fluid under pressure is supplied to separate passages leading to said diaphragm chambers, and a fluid strainer mounted in said strainer chamber and accessible through said opening. I

11. A fluid actuated acoustic signal comprising a supply pipe, a casing havingastrainer chamber connected with the supply pipe and a diaphragm chamber connected with the strainer chamber by a passage of relatively small flow area,

and a strainer within the strainer chamber through which fluid flows from the supply pipe to the said passage and diaphragm chamber, the

said strainer having a relatively large flow area relative to that of the said passage.

12, A fluid actuated acoustic signal comprising a supply pipe, a casing having a strainer chamber connected with the supply pipe and communicating with an opening in the said casing and a diaphragm chamber connected to the strainer chamber by a passage accessible through said opening, a strainer within the strainer chamv her through which fluid flows from the supply pipe to the said passage and diaphragm chamber, the said strainer being accessible through the said opening, and a closure for the said opening.

13.'The combination with a sound producing 

